Together with other biomedical engineering researchers at Columbia University, Guo and Laksanasopin have built a tiny smartphone accessory that can detect HIV with a finger prick. It costs just $34 to make. It delivers results in 15 minutes. And according to the researchers, it’s on par with the most accurate of HIV tests.

Together with other biomedical engineering researchers at Columbia University, Guo and Laksanasopin have built a tiny smartphone accessory that can detect HIV with a finger prick. It costs just $34 to make. It delivers results in 15 minutes. And according to the researchers, it’s on par with the most accurate of HIV tests.

Here’s another reason to expect Apple AAPL +7.23% to report record iPhone sales in China later today: for the first time ever, the company became the top selling smartphone maker in China this last quarter by units shipped, according to new stats from research firm Canalys.